@num:20px;

div{
   font-size: if((@num>10),@num,12px);
}
p{
  content:if((false) or (isstring("boo!")), foo, bar);
}

@list:'audo',"benz","honda","toyota","mahindra","suzuki","volkswagee";
p{
    @val:length(@list);
    font-size: @val;
}

p{
    @list:10px,20px,30px,40px;
    @val:extract(@list,2);
    font-size: @val;
    color:#fff;
}
p{
    padding: range(10px,40px,10px);
}

@columns:range(1,12);
each(@columns,{
    .column-@{value}{
        width:@value * 100% / length(@columns);
    }
})
